Evolution does not work quite the way you are thinking. First of all, you need to understand the timescales, and understand how fossils work. The timescale for evolution is *billions* of years, not millions, and the fossil record only shows us what was successfully preserved in sedimentary deposits. This means that we are piecing together thousands and millions of bits of evidence from fossils, and we are *not* seeing entire organisms in clear transition. Second, evolution works by "trial," with variations appearing within populations, and groups of animals and species responding over time to changing conditions. We see many examples of small and large changes (extinction events or small habitat changes), and we see many examples of sudden appearance or disappearance of large lines as well as small gradual changes. Third, the fossil record does, in fact, show gradual changes and transitional species. We see dozens of related "Homo" species as precursors to man over the past few million years, with two closely related species (Neanderthal and Cro-Magnon) as recently as 25,000 years ago. Similarly, we see dozens of proto-horse, proto-large-cat,, and even proto-tree species in the fossil record. Everywhere we look, we can find both gradual change and drastic change in operation. Finally, we can see evolution happening much more locally and recently than the fossil record. Many studies of existing species of birds, animals, and plants demonstrate the relationships and changes of species through morphology and DNA, and we can see micro-evolution going on in response to various kinds of selection pressure in all kinds of populations around the world. I hope this helps your understanding a bit. Feel free to do some library, web, or academic consulting to get more details on any of what I have said.